PhabricatorCalendarEventAvailabilityController.php
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	<?php

	final class PhabricatorCalendarEventAvailabilityController
	extends PhabricatorCalendarController {

	public function handleRequest(AphrontRequest $request) {
	$viewer = $this->getViewer();
	$id = $request->getURIData('id');

	$event = id(new PhabricatorCalendarEventQuery())
	->setViewer($viewer)
	->withIDs(array($id))
	->executeOne();
	if (!$event) {
	return new Aphront404Response();
	}

	$response = $this->newImportedEventResponse($event);
	if ($response) {
	return $response;
	}

	$cancel_uri = $event->getURI();

	if (!$event->getIsUserAttending($viewer->getPHID())) {
	return $this->newDialog()
	->setTitle(pht('Not Attending Event'))
	->appendParagraph(
	pht(
	'You can not change your display availability for events you '.
	'are not attending.'))
	->addCancelButton($cancel_uri);
	}

	// TODO: This endpoint currently only works via AJAX. It would be vaguely
	// nice to provide a plain HTML version of the workflow where we return
	// a dialog with a vanilla <select /> in it for cases where all the JS
	// breaks.
	$request->validateCSRF();

	$invitee = $event->getInviteeForPHID($viewer->getPHID());

	$map = PhabricatorCalendarEventInvitee::getAvailabilityMap();
	$new_availability = $request->getURIData('availability');
	if (isset($map[$new_availability])) {
	$invitee
	->setAvailability($new_availability)
	->save();

	// Invalidate the availability cache.
	$viewer->writeAvailabilityCache(array(), null);
	}

	return id(new AphrontRedirectResponse())->setURI($cancel_uri);
	}
	}